Step down drive gear



R. BERINGER 1,848,988

STEP DOWN DRIVE GEAR March s, 1932,.

Filed Nov 1 1926 Patented Mar. 8, 1932 UNETED STATES PATENT QFFITCEy RSCOE BERINGER, OF DIETROIT, MICHIGAN, .ASSIGNOR T GENEItALlVIOTORS COjR-Y PC RATION, 0F DETROIT, MICHIGAN, AICORPORATION OIE' `ll'iiI-TJAiii/'A'.RE v

STEP DownV DRIVE enen Application filed November 1, 1,926. Serial No.` 145,632.

Thisis an invention pertaining to transmission gearing` and is of a type similar to that described in my patent for four-speed transmission, No. 1,823,421 dated September 15, 1931.

The present invention, like the other. is intended for use particularly on motor vehicles and is arranged to give a direct clutch connectlon between the clutch driven shaft and the transmission shaft and also a step-down drive through a comparatively quiet internal to so arrange the gearing that when the driving and driven shafts are clutched for directl and highest speed both the internal gear train and the external gear trains are inactive and atrrest.

Another object is to so relate the internal and external gearing that the final drive shaft of the internal gear train drives the countershaft, and is also the gear to which the slidable intermediate gear may be clutched to secure a driving ratio corresponding to the usual high gear.

Other objects will be understood from the following description and from an examination of the accompanying drawing.

rThe single. ligure of the drawing is a longitudinal section through the transmission housing.

Referring by reference characters to the drawing, numeral 1 represents the transmission housing having a cover 3. Mounted in the cover is the shift lever 5 and 7 is a conventional showing of the lock which is no part of the invention and need not. be further described. Any desired interlock between the shift rods. one of which is shown at 9. may be employed. The shift rods carry forks 11. 13 and 15 for sliding the gears. as usual.

The'housing 1 receives shafts 17 and 19, shaft 17 being the clutch driven shaft and shaft 19 the transmission shaft. These shafts are as shown in alignment, with the end of transmission sha-ft being received within the end of the clutch driven shaft, suitable bearings being provided at 21. Suitable bearings 23 and 25 are provided -kfor the aligned shafts.l The countershaft 27 is mounted in the casing beneath the aligned shafts.V kAssociated `with the countershaft 27 is an idler gear, not shown, to give a reverse drive. The countershaft has a driven gear 29 secured thereto and driving gears 31, 33 and 35 for intermediate, low and reverse drive. Slidable on a-,splined vportion 37 of the transmission shaft-is agear 39 moved byfork 11 to -eiiga'ge gear 33 for driving in low, or the idler which engages gear 35lfor driving in reverse. x l Y' -Also slidable on the splined portion of the transmission shaftv is a gear 41 moved by fork 13 for engaging gear`41 with gear31 for'an Y l.intermediate speed. Gear 41 may be moved to the right in which position it is clutched by the'engagement of its internal teeth 45 with external teethY 47 of gear 49. Gear 49 is always iii-engagement with gear 29 of the v countershaft. It will be seen that this gearing is like theusual three-speed and reverse gearing, differing therefrom'in thatV gear 49 is not a. gear iXed to the clutch driven shaft.

Gear 49 is secured by suitable fastening` means 51to a sleeve 53 which is rotatable around the transmission shaft at the portion ofthe shaft'beyond the splined portion 37. The' housing is provided with two brackets 55 and 57 having aligned circularopenings ecw centric with reference. to the aligned shafts and surrounding .the said shafts. Within said openings in bearings 59 'and 61. are journalled outwardly extending Vannular flanges 63 and 65 of a barrel shaped gear whoseheads" Y,

are shown at 67 and 69.A Head 67 has an in-A tegral outer ring portion 71 and the head v69 y is secured thereto by a threaded Vring `70. Head 69 has an inwardly directed flange 73 with external teeth 7 and internal teeth 77. Sleeve 53 is formed with a flange 79'having internal teeth 81 `over-hanging teeth 75 of the barrel gear'and engaging the.y same at one positioinat the bottom, as shown in the drawing.

barrel and rotatableabout the same is the en- Sleeve :i3-has an extension through the` p larged part 83 of a sleeve 85, the sleeve 85 driven by the eccentric gear, means to clutch itself being rotatable about the driven shaft the driven shaft into engagement with said beyond the end of sleeve 53. The sleeve 85 is second sleeve. provided with external teeth 87 Within the In testimony whereof I aiix my signature. 5 barrel and engaging teeth 77 at the upper ROSCOE BERINGER. 10

portiomzaslshownfin theiigure. #Sleeve-85, outwardly# off: theflg-arrelih'asnexterlfalh teeth 88. Adjacent sleeve85 is a clutch v39 keyed to the driven shaft and having teeth 91spaced Menem teeth-88. 75

The oiutrhi'driven shaft has afzian'ge' 93 located just Within the bearing QB-and fromthe ange projects a slotted sleever- 95. Within the sleeve are teeth or splinesengagedgbynlJ clutch 97. Clutch 97 is secured to a collar 99 80 Sislidable .along the outensnrtaeefofthe' slotted Y fsleevel95,Ithe'conneetionbeing imade' bv `suitlialole"fasteninnwmeans'rlOl'extendingthrough ithefslots. i Clutchb97 has teeth `IQSIv'Vh-i'chare E to lbe emragedwithteetli88 of'thezsleeveor y 80 iwith:teeth 91-foff`the` olutchf`89.

'fBythe :arrangements describedfthe teeth 'of f"f c],ut'cli 97fare 1no1*mallv.-vexce'jotfir the ca se of -thedirectd-riveg kept 4in 'engagement Withthe ff'teeth 88 'oifsleeve-f jvhereby'the internal f gear ftrain, :inclifdingthe `Pecce'ntric gear, drivesgear 219i andthe latterkeeps the' counltershaft innrotation. f Under 'these"circum f-fstanees the-Fshitingrof gear-S539 and 411=jefives r la Clfrive'inreverse, iii loW:or-'n'intermediate. y 35 If gear 41 is moved to the ri'ghtjit mayfbe v 1f-"clutchedrtoigearl). This fclfutch engagement lfg/ivesf the.fdirect drivel'V betweenE the# driven 35S-shaft 19 and the'nalldriven"gear ofthe'inj F Itern'algearitrain49- It =is1intendedfthatthis v i" ffflrivershall'f represent azsjoeedi substantially Y f f: like fthel usual iliigh. 1;'I`o directly; clutch.` .fthe I ffclutchf: drivenfi sh'aift tvith'l thetransmis'si'on :-'Isli'ft,'1'to securethehighest@ossiblespeed, "gearel is movedftofneutralpositiioncfasshown Y l i" 1W e :in the drawing.; 'and` clutch 97fis mov'edto enwgaigeiteeth' 1.03 with'.teethvk 91,11; whereupon not oniyf` is @there aldirectidriveihetwe'enxshafts 17 and `19 butthe"Whole system of internal Vgearo 4% and thei-@eumeeshafegemmg ie me. 'lhe airrangementt-is'feompact, the :internal igezmtrain isf'so positioned relativefto'the' bear- 'fii'ngsfas towbe yWell supported an d'zthe shifting vfisffsmmufch like'rthat already-amibiar to `fthe *medewer-ofthe presenteday: ears asrto loff-erano Y l@ fs'diticiiltyimmanipulation. IIy claim: iInnombinationgiligned drivin gamf driven ishafts; achrtelrrotatablefwith and slidab-leon "'55 theend: osaid; driving.' shaft; a clutch fixed to tithe adj acentend of said' drivenshaft,- a sleeve frotatable: about-.said driven fshtt having eX- l'rfternal teethtsp aced' 'fronn he f f teeth;V off' Ythe lclutehfixedto lsaidshaft;means `tomove said f'ofislidablec clutch finto' engi-agement' With the 251' '.fteeth ofid'rirenfishaft'zeluteh or'rthe .teeth of ithei 'frotatable 'sleev:e,-. f an .i internal @gear ec- Beirtricallyf: surroundiirg-"saidC sleeveigearing between'said"sleeve:and internalvgear, a-fsec- '55ondisleevesurroundingsaidi drivenfshaft and l T- 

